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mat0 -- Simple matrix with rows and columns missing.
40 real
10 10 2
10 20 -1
20 10 -1
20 20 3
20 30 -1
30 20 -1
30 30 3
30 40 -1
40 30 -1
40 40 3
0 00 0
0
0
0
0
0
0
0
0
0
34
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0